Quantification of Allelopathic Potential of Sorghum Residues by Novel Indexing of Richards' Function Fitted to Cumulative Cress Seed Germination Curves

Lehle, F.R. and Putnam, A.R. (1982) Quantification of Allelopathic Potential of Sorghum Residues by Novel Indexing of Richards' Function Fitted to Cumulative Cress Seed Germination Curves. American Society of Plant Biologists, 69 (5). pp. 1212-1216.

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Abstract

The inhibitory activity of aqueous extracts of field-grown sorghum (Sorghum bicolor cv. Bird-a-boo) herbage and roots was quantitatively indexed by three aspects of cumulative cress (Lepidium sativum cv. Curlycress) seed germination: the germination onset; weighted mean rate; and final germination percentage. Extract potency was greatest for herbage collected four weeks after planting but declined sharply thereafter as the plants matured. About 91% of the inhibitory activity obtained from four-week-old herbage was in a low molecular weight fraction. Differential effects of herbage and root extracts on cress seed germination suggest that the nature and/or proportion of biologically active substances extractable from these plant parts is dissimilar.

Item Type: Article
Author Affiliation: Department of Horticulture, Pesticide Research Center, Michigan State University, East Lansing, Michigan 48824
Subjects: Crop Improvement
Plant Physiology and Biochemistry > Plant Physiology
Divisions: Sorghum
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 14 Apr 2012 10:52
Last Modified: 14 Apr 2012 10:54
Official URL: http://dx.doi.org/10.1104/pp.69.5.1212
URI: http://eprints.icrisat.ac.in/id/eprint/4717

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